Merchants and manufacturers there, have constant occasion for money or credit; and at the same time, they cannot be supposed to have either real or personal estates to pledge, in order to obtain a loan directly from the banks, who ought to lend upon no other security. To remove that difficulty, we find a set of merchants, men of substance, who obtain from the banks very extensive credits upon the joint real and personal security of themselves and friends. With this assistance from the bank, and with money borrowed from private people, repayable on demand, something below the common rate of interest, they support the trade of Scotland, by giving credit to the merchants and manufacturers. To this set of men, therefore, are banks of circulation upon mortgage to leave that particular branch of business. It is their duty, it is the interest of the country, and no less that of banks, that they be supported in so useful a trade; a trade which animates all the commerce and manufactures of Scotland, and which consequently promotes the circulation of those very notes upon which the profits of the banks do arise. These merchants are settled in all the most considerable towns: they are well acquainted with the stock, capacity, industry, and integrity of all the dealers in their district: they are many; and by this are able to go through all the detail which their business requires; and their profits, as we shall see presently, are greater than those of banks, who lend at a stated interest. The common denomination by which they are called in Scotland, is that of bankers; but to avoid their being confounded with bankers in England (whose business is very different) we shall, while we are treating of the doctrine of banks, call them by the name of exchangers, since their trade is principally carried on by bills of exchange. As often as these exchangers give credit to dealers in any way, they constantly state a commission of ½ _per cent._ or more, according to circumstances, over and above the interest of their advance; profits which greatly surpass those of any bank. One thousand pounds credit given by a bank, may not produce ten pounds in a year for interest: if given by a banker, to a merchant, who draws it out, and replaces it forty times in a year, there will arise upon it a commission of 20 _per cent._ or 200_l._ This set of men are exposed to risks and losses, which they bear without complaint, because of their great profits; but it implies a detail, which no bank can descend to. These exchangers give way, from time to time; and no essential hurt is thereby occasioned to national credit. The loss falls upon those who lend to them, or trust them with their money, upon precarious security; and upon merchants, who lay their account with such risks. In a word, they are a kind of insurers, and draw premiums in proportion to their risks.